Overview
Silicone AB refers to two-component addition-cure silicone rubber systems consisting of a base (Part A) and a curing agent (Part B). When mixed in specified ratios, these components undergo a platinum-catalyzed reaction to form a durable, flexible elastomer. Unlike condensation-cure silicones, AB systems produce minimal byproducts during curing, making them preferred for precision applications. They are valued for their stability across wide temperature ranges (-50°C to +200°C) and excellent dielectric properties.
Physical and Chemical Properties
Cured silicone AB exhibits Shore hardness ranging from 10A to 70A, with tear strength between 10-50 kN/m depending on formulation. Its thermal conductivity is typically 0.2-0.3 W/mK, while volume resistivity exceeds 10^14 Ω·cm. The material demonstrates exceptional UV stability and weather resistance, with less than 10% compression set after prolonged use. It is chemically inert to most solvents, though concentrated acids/alkalis may cause degradation. Oxygen inhibition does not affect the cure, allowing thick section molding.
Main Applications
In industrial manufacturing, silicone AB is extensively used for making durable molds for polyurethane, epoxy, and polyester resin casting. The automotive sector employs it for gaskets, vibration dampers, and wire insulation due to its temperature resilience. Electronics manufacturers utilize it for potting sensitive components, achieving UL94 V-0 flame ratings in some formulations. Medical device prototypes often use platinum-cure AB silicones for their biocompatibility in cured form. Additional applications include architectural sealants and flexible tooling for composite production.
Safety and Storage
Uncured components may contain inhibitors like methylbutynol which can cause mild skin irritation. Always wear nitrile gloves and safety glasses when handling. Ensure adequate ventilation as some formulations release trace hydrogen during cure. Store Part A and Part B separately in original containers, avoiding contamination. Shelf life is typically 12 months at room temperature. Inhibited versions require refrigeration below 10°C for extended storage. Never mix large batches without proper heat dissipation planning - the exothermic reaction can reach 80°C in bulk.
B2B Procurement Guide
Industrial buyers should specify required parameters: mix ratio (commonly 1:1 or 10:1), pot life (5min to 4hr), and Shore hardness. For tooling applications, prioritize low shrinkage (<0.1%) and high tear strength grades. Verify supplier certifications for ISO 10993 (medical) or UL94 (flammability) if required. Bulk purchases (200kg+) typically offer 15-30% cost savings. Consider ordering pre-colored variants to eliminate post-cure painting. Always request MSDS and technical data sheets before large orders.
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